Steam-actuated valve for engines.



A. GQSTOKES. STEAM AOTUATED VALVE FOR ENGINES.

APPLIOATION FILED I'EQB. 25, 1907 899,849 Patented Sept. 29, 1908.

3 SHEETS-SHEET 1.

WITNESSES INVENTOR' Altomeys.

, JRRIS PETERS. |NC.. Lxrno WASHINGTON D C A. G. STOKES. STEAM AGTUA-TED'VALVE FOR ENGINES. APPLICATION FILED FEB. 25,1907. I 8'99,8'49,- Patented Sept. 29, 1908.

Alforneys.

APPLICATION FILED FEB. 25, 1907.

3 SHEETSSHEET 3.

INVENI'OR mvQA ${0KQ5 8v Allor" s.

Patented Sept. 29, '1 908.

15 H both'the'chestp ston connected to the pump pisto -1 I 4 n' gseas ie,

A R D G. s ems, oF BELoIT, WI

I s'rnAM lAcTuAnnn vALvis nontnncmnsl To all whom it ma concerh:

Be it known that I, ALFRED G. STOKES, a

- citizen of. the United States-of America; re-

siding'at Beloit, in the 'county of Rockand State of Wisconsin; have invented certain ,7 a 1 rovements in steam engines and particunew "and useful Improvements in Ste'a1n- 4 Actuated Valves for Engines, of which the following is a s ecification, reference being had therein to't ejaccornpanying drawings. My invention relates to new and useful 1marly to that" type of steamiengine which is pted for* use .in driving feed] and other object is tofprev'ent, the

none ebject of; the invention i s to control M an the' cylinde ror. main 'pistonbyja' fsingle sli e valve; another sticking of the chest piston;- third, to obviate dead centers; fourth, to arrange the'partsconveniently for inspection and lubricationyand, fifth; to secure simplicity of the entire mechanism.

h The novel construction 1 of' 'parts 7 whereby and. arrangement k v I have attainedithese objects will bein re fully herelnafteifdescribed ,Inithe drawi gs; Figure 1i stews a 1011 i- 3 tudinal verticalcentralsectionthrough t e engine Fig. 2 shows a horizontal section so". 1 1 f1; 'F'l'g. 3 showsa transverse vertlcal sectlon through lthe steam chest on line w ar: of Fig.

onli'nes yy'of Fig. Fig.4 shows a transverse vertical'section on lines z.'z, of Fig. 1;

exhaust chamber 11 ant withthe mainfexhajust' 50,

and Fig. 5 shows 'a longitudinal vertical central s'ectionithrough the engine with the parts in the positions showninFig. 4.

" f 1 is the cylinder of a steam pumping en ""gine, preferably connected by'a cradle -6 to.

lead from opposite en points adj afc'ent to the s lead from opposite ends I? lower end of theIi-side lever 23 is connected to the cros'shead 25 on the piston the cam 20. This' will rock 6am chest to. P0111175 j w nt steam, hamber 1.0 and exhaust chamber i fipecificationof llettersPatent. "Patented Sept. 29,1908. Application ma February 25, 1907. Serial No. 353,143.

' Inthe steam chest'is a, slide valve 15 having a groove in its topfor engagement with lug L116 suitably secured to the chest piston, as'b'y the screws 17. This valve has notches 1'8'in its sides arranged to'ex ose the ends of ooNsIN, AssIeNoItTo FAiRBANKs, MORSE & 00.,[95 cnicAeo, ILLINOIS, A} CORPORATION, OF ILLINOIS.

passages 14 to the pressure 0 steam chamber f 10in certain positlons of the valve and in its 'lower faceisa port or concavity 19of sufiicient size to connect the exhaust chamber: with either'of the'passages1-3 in different positions Qithe val've. This valve is arranged" to exposethepassagesj13 to steam pressure nlthe chamber 10 alternately when reciprocated longitu( iinall'y of the steam chest. A bifurcated cam 20is secured to the stem 8 an'dis', arranged to be engaged an anti-friction roller-21' journaled on a pm 22 projecting from the side lever 23 .fulcruined on the projection .24 on the cr'adle6., The 1 pivotally 1 7 3 t o g s pivotal1ink26. 1 f Onthestem 8 is"v a stop 'collar '27 arranged to be engaged alternately with the end of the cam 20 which also serves'as a stop collar, by the sliding sleeve 28 actuated "end of the sidelever 23 throng the pivotal l k i Q The 0 eration of the construction above describe is as follows; Steamhaving been admitted to the chamber '10 throughthe port 9; it will be'seen that one of the, passages 13 or one, of the assages"14is'exposedto pres sure from sai Assuming theparts to be in the'positions shown inFig. the steam will pass throughthe rear passage 13 and carry the iston'2 in the directionol the arrow until t erollcr 2 1 strikes the up er fnrcation of t e ehest piston '5 and carry the valve 15 transversely to'the position shown in Fig. 2,: thus' bringing one of the notches l8-in'linewith the end of the forw aid passage 14, as shown. In tho-further movement offlthe iston 2,v the sleeve 28 will sti ikelthe end of t e cam 20' and retractthe chest piston 5 until the notch 18 exposes the f orward.p'assage 14139 the pressurein" chain her; 10' and one of the extensions 30 of the concavity 19 the lower face of the valve 15 connects the rear passage 14 with the exhaust chamber 11, as shown in Fig. 4. In. this position} it will be "seen that the sli ht retrac- .tion of the chest piston has causedithevalve chamber in'every positionof 'ithe chest pistonand 'valve, thus. avoiding dead centers y the upper' "15 to partially close the passages 13, as

' shown in Fig. 5.

This partial closing of the main ports just previous to the end of the stroke eases the action of the pump and high speed is -.permitted without slamming the pump check valves. The retraction of the valve and exposure of forward passagefl i to pressure and rear assage l4 to-exhaust'immediately'. causes t e complete retraction of the chest piston and the throwing over of the valve 15, and at the other end of thestroke the same sequence of operations is accomplished, the roller 21 striking the lower ,furcation of cam and the sleeve 28 striking stop collar 27.

From the above descripltion of the operat1on, it will be seen that t e reciprocation of the chest piston controls the main or cylinable by said cylinder piston for rocking said chest piston to transversely reciprocate said valve and for reciprocating said chest piston I to longitudinally reciprocate said valve, said-- transverse and longitudinal reciprocation controlling said chest piston.

. 2. In a steamen ine, the combination with a' cylinder, a piston therein, a steam chest, a piston therein, a valve adapted to be longitudlnally reciprocated by said chest piston ina horizontal lane to control the move- 'mentfof said cylin e. piston, and means operable by said cylinder piston for shifting said valve transversely in a horizontal plane and for. reciprocating said chest piston.

3. In a steam engine, the combination with a. cylinder having passages communicating with its opposite ends and a piston in said cylinder, of a steam chest having passages communicating with its opposite ends, a chest iston in said chest, a valve connected to sai chest piston and controlling said cylinder andsteam chest passages, and means for transversely, and longitudinally reciprocating said valve in a horizontal plane near the end of each stroke of said cylinder piston for opening and closing said steam chestpassages and for partially closing said cylinder passages, for the purpose described.

4. In a, steam engine, the combination with a cylinder and a piston therein, of a steam chest, a chest piston therein, a valve arranged to be transversely and longitudinally reciprocated by said chest piston in a horizontal plane for controlling said cylinder piston, a piston rod for said cylinder piston, a stem 'on said chest piston, and connections between said rod and stem for rocking and reci rocating said stem, for the purpose descri ed. v

5. In a steam engine, the combination with a cylinder and a piston therein, of a steam chest and a piston therein, of a valve, means controlled by said cylinder piston for imparting an oscillating and longitudinally rec1pro-- eating movement to said chest piston, and connectionsobetween said chest piston and valve whereby said oscillating ant. longitudinally reciprocating movement ofsaid chest iston imparts to said valve a transverse and ongitudinal reciprocation in a horizontal plane.

6; In a steam engine, the combination with a cylinder and a piston therein, of a steam chest and a piston therein, a valve, said. chest piston and said valve being provided one with a c lindrical lu and the other with a'eorrespondnigly shape roove adapted to cooperate therewith, and connections between said cylinder piston and chest piston for imparting a rocking and reciprocating movement to said chest piston.

7. In a steam engine, the combination with a cylinder and a piston therein, of a steam chest and a piston therein, of a valve, a cylindrical lug secured to the underside of said chest piston and engaging a correspondi ly shaped groove in the upper side of said va ve, and connections between said cylinder piston and chest piston for impartinga rocklng and reciprocating movement to said chest piston.

8.- In a steam engine, the combination with a cylinder having passages communicating with its opposite ends, a piston in said cylinder, a steam chest having )assages communicating with its opposite on s, a piston in saidchest adapted for a reciprocating and oscillating movement, a slide valve adapted for transverse and longitudinal movement in one plane and having a cavity therein controlling the passages to the cylinder and notches in its sides controlling the passages to the steam chest, a valve stem extending from said chest piston, a cam carried thereby, a rocker arm operated from the piston rod oft the engine and ada ted to engage said cam, is pets carried by the valve stem, a cross head slidably mounted on the valve stem intermediate said tappcts, and a link connecting said cross headand rocker arm.

9. In a direct acting engine, a cylinder, a piston therein, a steam chest, a piston therein adapted for a reciprocatin and oscillating movement, a valve. operable by said chest piston and movable longitudinally and transversely to control the )assage of steam to the o posite ends of sai cylinder and. steam crest, and means for operating-said valve,

said meansincluding, avalve rod extending in two directions on said' valve seat and con? 26 vfrom the chest piston, a cam on said valve. trolling the ports therein, said valve being rodmrockerarm-pivoted to the framje of-the operatlve'ly connectedto the piston in the engine and adapted-to'fbe operatedby, the.

.tappets arr-"the valve rod, in cross head steam ch est, andfmea'ns for operatin said main piston rod, airolleron' said'rocker-arm' steam chest piston, said means inclu a adapted to engagethe cani- -on the valve rod, valve stem extending from the steamichest 25 to partially rotate-the same'and-lockitin piston, a; cam thereon," and arocker arm' pos tion after its rotary motion is completed, actuated by the piston rod of the engine and 4 j 'oo'sely' adapted to, cooperate. with said canr, said".

- mounted on the-valve rod intermediate said cam and rocker arm forming a lockingdevip' t'appets, and: means for actuating said cross preventing undue shifting of'thevalve While 39- head from the. main piston rod; a eing thrown finally by steam. 1 a a 10.'In. a steam engine, .the combination In testimony whereofl aflix my' signatu're with a'cylinde'r and a is'ton therein, a steam in presence of two'witnesses.

chest and ,apiston t erein adapted for-a E reciprocating and oscillatin movement, a fiat valve seat provided Wit 7 ports therein Witnesses: I communicating with opposite ends of the" I A; R. HULL,

cylinder and steam chest, a valve'movable v Gno. B. INGERSOLL. 

